Surface Tension, Density and Viscosity Studies on the Associative Behaviour of Oxyethylene-Oxybutylene Diblock Copolymers in Water at Different Temperatures — Oak Academic Publishing
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Surface Tension, Density and Viscosity Studies on the Associative Behaviour of Oxyethylene-Oxybutylene Diblock Copolymers in Water at Different Temperatures
Department of Chemistry, Quaid-I-Azam University, Islamabad, Pakistan
,
Department of Chemistry, Quaid-I-Azam University, Islamabad, Pakistan
,
Department of Chemistry, Hazara University, Mansehra, Pakistan
,
Department of Chemistry, Hazara University, Mansehra, Pakistan
,
Department of Chemistry, Quaid-I-Azam University, Islamabad, Pakistan
,
Department of Chemistry, Quaid-I-Azam University, Islamabad, Pakistan
1 Department of Chemistry, Quaid-I-Azam University, Islamabad, Pakistan
2 Department of Chemistry, Quaid-I-Azam University, Islamabad, Pakistan
3 Department of Chemistry, Hazara University, Mansehra, Pakistan
4 Department of Chemistry, Hazara University, Mansehra, Pakistan
5 Department of Chemistry, Quaid-I-Azam University, Islamabad, Pakistan
6 Department of Chemistry, Quaid-I-Azam University, Islamabad, Pakistan
The associative properties of methoxy (CH 3 O-) ended E 58 B 11 and hydroxyl (-OH) ended E56B19 oxyethylene-oxybuty- lene diblock copolymers in aqueous solution at different temperature are reported in this paper. For both copolymers, E represents an oxyethylene (-[CH 2 CH 2 O]-) unit and B an oxybutylene (-[CH(C 2 H 5 )CH 2 O]-) unit while the subscripts denote the number average block length. Surface tension measurements were used to find out surface excess concentrations (Γ m ), area per molecule (α s 1 ) at air/water interface and Gibbs free energy for adsorption (△G 0 ads ) for the pre-micellar region at four temperatures. Likewise thermodynamic parameters of micellization such as, critical micelle concentrations (CMC), enthalpy of micellization (△H 0 mic ), standard free energy of micellization (△G 0 mic ) and entropy of micellization (△S 0 mic ), were also obtained using surface tension measurements. Solution densities were used to deter-mine the partial specific volume of micelle ( V mic ) and micellar density (ρ mic ). Dilute solution viscosities have been used to estimate the intrinsic viscosities [η], solute-solvent interaction parameter (K H ) and hydration value of micelle (W h ) at various temperatures. The effect of temperature on the micelle properties is also discussed.
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